Method for Quantification of Wear of Sheared Joint Walls Based on Surface Morphology |
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Authors: | T Belem M Souley F Homand |
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Institution: | 1.Department of Applied Sciences,Université du Québec en Abitibi-Témiscamingue (UQAT),Rouyn-Noranda,Canada;2.Institut National Polytechnique de Lorraine (INPL),LAEGO-INERIS/DRS/RNOS, école des Mines de Nancy,Nancy Cedex,France;3.Institut National Polytechnique de Lorraine (INPL),LAEGO, école Nationale Supérieure de Géologie de Nancy (ENSG),Vand?uvre-lès-Nancy Cedex,France |
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Abstract: | Roughness and wear evolution of three different joint wall surfaces were characterized using surface roughness and surface
wear parameters. Parameters were defined by considering the two components of morphology: waviness (“primary” roughness) and
surface roughness (“secondary” roughness). Two surface roughness parameters are proposed: joint interface (or single wall)
specific surface roughness coefficient SR
s
(0 ≤ SR
s
≤ 1) for quantifying the amount of “pure” roughness (or specific roughness), and degree of joint interface (or single wall)
relative surface roughness DR
r
(0 ≤ DR
r
≤ 0.5). Two further parameters are also proposed in order to quantify the wear of wall surface: joint interface (or single
wall) surface wear coefficient Λinterface, and the degree of joint interface (or single wall) surface wear D
w(interface). The three test specimens were: man-made granite joints with hammered surfaces, man-made mortar joints with corrugated surfaces,
and mortar joints prepared from natural rough and undulated schist joint replicas. Shearing under monotonic and cyclic shearing
was performed using a computer-controlled bidirectional and biaxial shear apparatus. Joint surface data were measured using
a noncontact laser sensor profilometer prior to and after each shear test. Calculation of specific surface roughness coefficient
SR
s
, and degree of surface wear D
w
, indicated that the hammered joint interface with predominant interlocking wears much more (>90%) than the corrugated (27%)
and the rough and undulated (23%) joint interfaces having localized interlocking points. The proposed method was also successfully
linked to the classical wear theory. |
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Keywords: | |
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